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时间:2019-07-18
《DEM simulation of the mixing equilibrium in fluidized beds of two solids differing in density》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、Availableonlineatwww.sciencedirect.comPowderTechnology184(2008)214–223www.elsevier.com/locate/powtecDEMsimulationofthemixingequilibriuminfluidizedbedsoftwosolidsdifferingindensityAlbertoDiRenzo⁎,FrancescoPaoloDiMaio,RossellaGirimonte,BrunelloFormisaniDipartimentodiIngegneriaChimicaedei
2、Materiali,UniversitàdellaCalabria,ViaP.Bucci,Cubo44A,87036Rende(CS),ItalyAvailableonline21February2008AbstractThedistributionofsolidsinmulticomponentfluidizedbedsstronglyinfluencesprocessperformance,asundesiredinhomogeneitiesusuallyresultfromabalancebetweenthemixingandsegregationtenden
3、cies.Inthepresentwork,acoupledDEM-CFDcomputationalcodeisutilizedtoinvestigateontheequilibriumdegreeofmixingoftwo-componentbedsofparticleswithequalsizeanddifferentdensityasfunctionoftheoperatingvelocityanddensityratio.Modelvalidationiscarriedoutfirst,bymeansofadirectcomparisonofsimulate
4、dandexperimentalresultsonthemixingindexandconcentrationprofilesalongthebedheight,foramixtureofsteelshotsandglassballotiniof433μmaveragediameter.Sincepseudo-2Dgeometryisusedinsimulations,theaveragevoidageandtheminimumfluidizationconditionsareverydifferentfromthoseoftheexperiments.Theref
5、ore,appropriatescalingofthevelocityisnecessarytocomparethetwosystems.TheDEM-CFDmodelisthenutilizedextensivelytoanalyzethebehaviourofthemixtureatdifferentvelocitiesandvaryingcomponentdensityratio.Acomprehensivedatasetisobtainedforadense-over-lightdensityratiorangingfrom1to3andavelocityr
6、atio(actualoverminimumfluidizationvelocityofthedensercomponent)intherange1to2.Theseresultsarere-examinedwithinauniqueframeworkbyproposinganewmodelcapabletointerpretdatawhilebeingmathematicallyandphysicallyconsistentwithrealobservations.Inversionofthismodelprovidesamixingmapforthefluidi
7、zedsystemwhosebehaviourischaracterizedforanycombinationofthetwopropertiesintherangesinvestigated.©2007ElsevierB.V.Allrightsreserved.Keywords:DEM-CFD;Fluidization;Binarymixtures;Mixing;Segregation1.Introductionprocessefficiencyandcomplicateitsthermalcontrol;inothercases,instead,theexi
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